Sökning: "sjöström"

Visar resultat 21 - 25 av 156 avhandlingar innehållade ordet sjöström.

  1. 21. Isothermal and Thermal Fatigue of Martensitic Chromium Hot-Work Tool Steels

    Författare :Johnny Sjöström; []
    Nyckelord :;

    Sammanfattning : A lot of our everyday products, e.g. car-parts and mobile phone covers, are shaped by using high temperature techniques, such as die casting, extrusion, forging or rolling. The die in all these forming processes play an important role, since it usually gives the object its final shape. LÄS MER

  3. 22. Mössbauer spectroscopy and theoretical studies of magnetic structures, band structures and hyperfine interaction in some transition metal compounds

    Författare :Jörgen Sjöström; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  4. 23. Surfactant Responsive Cross-Linked Polymer Hydrogels

    Författare :Jesper Sjöström; Research Policy Institute (RPI); []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; Fysikalisk kemi; Two-step binding isotherms; Resolubilization; Nonmonotonic transient volume changes; Swelling isotherms; Divinyl sulfone DVS ; Polyquaternium; Cellulose ethers; Amphiphilic cross-linked polymers; Responsive gels; Polymer-surfactant interactions;

    Sammanfattning : The focus of the thesis is on chemically cross-linked hydrogels which drastically change their volume when immersed in solutions of different ionic surfactants (with or without added salt). The two main questions addressed are: (1) How useful are simple gel swelling experiments to the study of polymer-surfactant interactions?, and (2) How does the volume of a cross-linked polymer gel change when it is immersed in a surfactant solution, both with respect to the equilibrium swelling and with respect to transient volume changes? Most of the gels studied were prepared by cross-linking linear polymers, which were well studied derivatives of hydroxyethyl cellulose (HEC). LÄS MER

  5. 24. Health and herd health planning in organic dairy herds

    Författare :Karin Sjöström; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : The status in European organic dairy production does not in all aspects, meet organic principles with regards to the aims of good animal welfare and health, and consumers’ expectations, and therefore needs to be improved. The aims of this thesis were to; assess the status of animal health in organic dairy herds; assess the structural characteristics, and their relation to implementation, of animal health plans; and to investigate a structured participatory and farm-centric approach. LÄS MER

  7. 25. Molecular epidemiology of pneumococcal carriage and invasive disease

    Författare :Karin Sjöström; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Streptococcus pneumoniae, also known as pneumococcus, is a major contributor to morbidity and mortality worldwide. It is the main cause of respiratory tract infections such as otitis media and sinusitis, but also causes millions of deaths each year due to pneumonia, meningitis and septicemia, especially among children and the elderly. LÄS MER